"Deadly Sin" part one! The twisted Harley Sinn's been released from prison, and she's looking to hurt Harley in a whole new way...by going after somebody she loved and lost! And to make this issue extra-unmissable, a brand-new backup story begins, set in Harley's earliest days with the Joker-and co-written by one of Harley's original creators, Paul Dini! "Harley Loves Joker" kicks off as Harley makes the biggest mistake of her burgeoning criminal career...accidentally revealing the location of Mistah J's hideout!